Another great quote!

“We are face to face with our destiny, and we must meet it with a high and resolute courage. For us is the life of action, of strenuous performance of duty; let us live in the harness, striving mightily; let us rather run the risk of wearing out than rusting out.”

—Theodore Roosevelt

Another favorite of mine, on the same theme:

"My, My, Hey, Hey, Rock N Roll is hear to stay. It's better to burn out than it is to rust, My, My, Hey, Hey!"